#
# A wrapper around the function 'plot()' that jitters variables with
# 8 or less values, and provides more space around the pointclouds.
# [The implementation is a nasty hack: it adds to more extreme points to the data...]
#
# The number 8 can be changed.
# The jitter amount is .4 of the smallest spacing between
# different values.
# Again, the number .4 can be changed.
#
# One of the great annoyances in R's scatterplots is that the extreme
# points are too close to the borders (top and right) and axes (bottom and left).
# This function provides 10% of the range on both sides as extra space.
# The number 10% can be changed with the 'extra' argument.
#
# [Also, the plotting character default is changed to 16, and
# plotting character size to .8.]
#
plot.plus <